Reliability-sustainable network survivability scheme against disaster failures

Disasters, such as earthquake, tsunami, tornado, and malicious attack, may cause large-area, geographically correlated and/or cascading failures in telecom networks, leading to massive connection disruptions and instability of network state. In this paper, we study survivability strategies to alleviate the effect of disasters to telecom networks, e.g., Wavelength-Division-Multiplexing (WDM) optical networks, and propose a reliability-sustainable survivability (RSS) scheme to recover the impacted (disrupted or currently not disrupted but the reliability decreased beyond a given threshold) connections with some degree of reliability and/or bandwidth guarantee. According to service-differentiated reliability and bandwidth thresholds, RSS first (re)routes the primary paths and/or adds secondary paths to sustain the reliability of connections, then (re)distributes the bandwidth of connections to optimize resource utilization. Simulation results show that, RSS can sustain the required reliability for connections, adapt to the post-disaster traffic fluctuations, and achieve satisfactory performance in terms of connection loss ratio and traffic loss ratio.